Well-pump jack.



C- B. McELWAlNE.

WELL PUMPJACK.

APPLICATION FILED MAY 11. 1911 1,261,573. Patented Apr. 2,1918.

' 3 SHEETS-SHEET INVENTOR WITNESSES C. B. McELWAlNE.

WELL PUMPJACK.

APPLICATION man MAY 11. 1911.

1,261,573. I Patented Apr. 2,1918.

3 SHEETS-SHEET 2- 115/? E lwama,

INVENTOR WITNESSES mmgm 4067M C. B. McELWAINE.

WELL PUMPJACK.

APPLICATION FILED MAY 11, 1911.

3 SHEETSr-SHEET 3' INVENTOR WITNESSES Mal/Z6,

crzal. A9 p BY my ATTORN EY UNITED STATES PATENT oEETcE.

CLAYTON IB. MQELWAINE, OF DRUMRIGHT, OKLAHOMA.

WELL-PUMP JACK.

Application filed May 11, 1917. Serial No. 168,007.

To all whom it may concern:

Be it known that I, CLAYTON B. MUEL- WAINE, a citizen of the United States, residing at Drumri ht, in the county of Greek and State of O (lahoma, have invented new and useful Improvements in Well Pump Jacks, of which the following is a specification.

This invention relates to improvements in pumping devices, and has particular reference to an improved pumping jack for operating oil well and similar pumps.

In pumping jacks as hitherto constructed the beam at the point of attachment to the pump rod describes an arcuate path, and the rod is constrained to follow such are, whereby it is continually subjected to lateral stresses, and undesirable wear and strain on the stufling box and other parts of the mechanism results. It is therefore my purpose in carrying out this invention to provide a pumping jack wherein the beam at the point of attachment to the rod will traverse a re:- tilinear path. It is my further intention to furnish improved relative arrangements for the parts of the jack; and to make provision for more efiicient oscillatory actuation of the beam by the power device provided.

With these and other objects in View I have embodied my invention in the form described in the specifications and claims and shown in the accompanying drawings, in which- Figure 1 represents a side elevation of the preferred form of the invention.

Fig. 2 is a plan View of the same.

Fig. 3 is a fragmentary view of the beam and supportingstructure, and illustrates means whereby the beam may be sustained by the support.

Fig. 4 is a side elevation of a modification showing a method for oscillating the beam which I may utilize in some instances.

Fig. 5 represents another modification as shown in side elevation.

Fig. 6 is a plan view of the same.

Fig. 7 illustrates in detail the supporting device shown in Fig. 5.

Referring to the drawings more particularly, and with especial reference to Figs. 1, 2, and 3, the upper portion of an oil well casing 1 is delineated therein, having the mouth provided with a stufiing box 2; and extending downwardly therethrough for actuation of a pump disposed within the well, is a pump rod 3, terminating at a convenient Specification of Letters Patent.

.tailed description.

Patented Apr. 2, 1918.

point above the stufling box in means, shown as trunnions 4, for pivotal attachment to the beam 5; such arrangements being similar to those commonly adopted and needing no de- In the present instance the beam 5 is bifurcated toward the outer end to receive the pump rod 3, and is formed transversely in the upper surface of the bifurcated portion 6 with a hollow 7 wherein the trunnions are journaled, and which may or may'not have caps to retain the trun nions therein. The beam extends laterally for connection to a suitable supporting structure 8, and in this form of my invention the structure 8 is formed longitudinally with a slot 9 for reception of the beam. For sustention of the beam I provide a link 10 having pivotal attachment at the lower extremity to a pin 11 or other suitable securing device extending transversely through the support 8 and the slot 9, and having pivotal attachment at the upper extremity to the beam at a point toward the pump; whereby it is disposed angularly to the support 8. Such lower attachment is here indicated as a hook 12 constituting the extremity of the link and extending within a slot 13 therewith the beam is formed vertically, for en gagement with a pin 14 inserted in the beam transversely thereof.

On the beam I place a cam, adapted to engage a track in the oscillatorymotion of the beam, whereby the beam will be forced outwardly from the support on passing the center of the stroke,- to maintain the trunnion bearing 7 in alinement with the pump rod 3. In the present instance duplicate cams 15 are secured in any suitable manner on either side of the beam 5 adjacent the support 8, the face of which constitutes the track; and are maintained in contact therewith by the weight of the pump rod and the angular disposition of the link 10, the pitman-17 hereinafter described constituting a fulcrum.

For actuation of the beam, the usual V member or jack 16 may be employed, having a horizontal arm 17 and a vertical arm 18 suitably braced, and adapted for rocking movement by a downward prolongation 19 of the vertical arm 18, preferably terminating in trunnions 20, having bearings in a lateral extension 21 of the base of the supporting structure 8.

The jack is disposed for movement in a plane parallel to that of the beam, and at the outer extremity of the horizontal arm 1, are dispensed with and the beam is formed with a prolongation 22 beyond the support 8, having the end adapted for attachment of a flexible tension element, as for instance a wire cable 23 which may be terminally connected for oscillation of the beam to a pumping enginein the usual manner. A

sheave 24: or other suitable friction reducing device for guiding and maintaining the tension element 23 in position is disposed b eneath the beam, and is properly journaled in a mounting 25, which may be anchored as shown in the drawing or otherwise retained in position. It will be noted that the link 10 is attached upwardly from the beam to compensate for the absence of the pitman 17'.

A.- further modification of my invention is illustrated in Fig. 5. In this instance, lateral pivot members 26 are attached to the beam adjacent the cams 15 for sliding movement in slotted openings 27 inclosed by horizontal guides 27 extending between and secured to vertical supports 28. The cams 15 preferably engage the supports 28 remote from the pump rod 3; and in this form of my invention the pitman 17 is inclined toward the support 28, whereby the weight of the beam maintains the cams in such enagement. F or actuation of the pitman a ack 16 is provided, similar to that shown in Figs. 1 and 2.

While I have here shown and described preferred forms of my invention for purposes of illustration, such embodiments are not to be interpreted as in any way limiting the spirit of the invention, it being apparent that many and varied forms may be constructed without exceeding the scope thereof.

I claim- I 1. In a device of the class described, a lever, av supporting structure, means for oscillating said lever, a linkhaving one end movably attached to the lever and having the other end attached to said support, and a cam on the lever adapted to engage a track to limit a point in said lever to rectilinear movement.

2. In a device of the class described, a lever, asupporting structure, means for oscillating said lever, a track, a link having one end attached to the lever and having the other end attached to said support, and a cam on the lever adapted to engage the track to limit a point in said lever to rectilinear movement; said link having an inclined position relative to the lever whereby said cam is maintained in engagement with said track.

3. In a device of the class described, a lever, a supporting structure, means for oscillatin said lever, a pump rod adapted for longitu inal movement by the lever, a link having one end attached to the lever and having the other end attached to said support, and a cam on the lever adapted to engage a track to prevent lateral movement of said pump rod.

4. In a device of the class described, a lever, a support for one end of the lever adapted to permit longitudinal movement thereof, a cam on the lever, a track adapted to be engaged by said cam, and means for retaining said cam in engagement with said track, said means consisting of -a member adapted to support the other end of said lever, said member having an inclined position relative to said lever.

5. In a device of the class described, a lever having a transverse member, guides adapted to permit lateral sliding movement of said transverse member, a cam on the lever and a track adapted to be engaged by said cam; link means for supporting and oscillating said lever, said link means having an inclined position relatlve to said lever whereby said cam is maintained in engagement with said track.

6. In a device ofthe class described, a lever, a supporting structure, means for oscillating said lever, a link having one end attached to said support, a hook on its other end connected with the lever, and a cam on the lever adapted to engage a track on the supporting structure.

In testimony whereof I aflix my signature.

CLAYTON MOELWAINE. 

